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    <!-- 
        网格系统：实现响应式的核心
        把整个屏幕宽度等分了12份


        手机端       col-xs-?? 

        平板 <750    col-sm-??

        大平板 <970   col-md-??

        电脑 >1200   col-lg-??
        
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                <li class="col-xs-4">1</li>
                <li class="col-xs-4">1</li>
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    <!-- 手机上2列   平板3列    电脑3列 -->
    <div class="list">
        <div class="container">
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                <li class="col-xs-6 col-sm-4 col-lg-3">1</li>
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    <div class="container">
        <div class="row">
            <div class="col-lg-2">1</div>
            <div class="col-lg-10">2</div>
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